Super-Kamiokande (22 pics)

Super-Kamiokande is a neutrino observatory which is under Mount Kamioka near the city of Hida, Gifu Prefecture, Japan. The observatory was designed to search for proton decay, study solar and atmospheric neutrinos, and keep watch for supernovae in the Milky Way Galaxy.

They are trying to detect neutrinos. Since neutrinos interact very little with matter it is a huge tank that is normally filled with 50 m of very pure water. The golden things around are detectors. To minimize background radiation it is located 1 km underground.